it's been pretty sad lately, so pls rec me some of your saddest mangas.

if it's yaoi then I gotchu. I literally made a list for this:
http://www.mangago.me/home/mangalist/454478/

http://www.mangago.me/read-manga/kimi_no_yume_o_mite_iru/
http://www.mangago.me/read-manga/itou_san_kuraka_sui/
http://www.mangago.me/read-manga/an_uncomfortable_truth/ http://www.mangago.me/read-manga/lonely_to_organdy/

"'10 years where I loved you the most"....definitely a heart breaking tearjerker guaranteed

Banana Fish

Yep, another good choice....another tearjerker